After a CCN instance is created, the system will automatically create a route table and control route entries to manage traffic on CCN. You cannot manually add or delete routes, but you can enable or disable them.
To automatically add a CCN route, there are three stages:
- Auto-propagation (formerly named “BGP” mode) is currently in beta. To try it out, please submit a ticket.
- AS-PATH description:
- The information of AS-PATH can be viewed in the direct connect gateway.
- AS-PATH supports a 32-bit string. If the string is exceptional, the route will be deleted, and a string exception event will be reported, for which you can configure event alarms.
- The maximum AS-PATH length is 30; if the maximum length is exceeded, the AS-PATH will be truncated, and a truncation event will be reported, for which you can configure event alarms.
- The AS-PATH that passes through direct connect gateway - CCN - direct connect gateway now supports three new AS numbers (45090, 139341, and 45090).
The non-check policy is currently in beta. To try it out, please submit a ticket.
10.0.1.0/20and that of route B is
10.0.1.0/24, route B will be first matched based on the longest mask principle when both routes are enabled.
10.0.1.0/20. However, other routes do not support ECMP and cannot be enabled simultaneously. For example, if there are two or more routes to the IP range
10.0.1.0/20whose next hops are VPC or VPC and direct connect gateway, only one route can be enabled.
See below for the description of inbound routes in the CCN-Direct Connect network architecture. For more information, see Direct Connect Gateway Overview.
- The CCN-based direct connect gateway created before September 15, 2020, 00:00:00 publishes the route of subnet CIDR block to the dedicated tunnel. For a BGP dedicated tunnel, the VPC subnet CIDR block is synced to IDC based on the BGP protocol.
- The CCN-based direct connect gateway created after September 15, 2020, 00:00:00 publishes the route of VPC CIDR block to the dedicated tunnel. For a BGP dedicated tunnel, the VPC CIDR block is synced to IDC based on the BGP protocol.
|Next Hop Type||When the Route will be Deleted|
|VPC in public cloud||VPC instance is unbound or subnet is deleted|
|Direct Connect Gateway||1. Direct connect gateway is unbound
2. Route is modified in direct connect gateway:
i. Manual entry (static): deletion
ii. Dynamic learning (BGP): IDC route update